The invention relates to a method for producing yeast extract, which comprises the following step: (a) autolysis, namely performing autolysis under the condition of keeping the pH value of a liquid yeast between weak acidity and neutrality, and adjusting the pH value for at least one time in the autolysis process to perform the autolysis under the condition of different pH values. The invention also relates to the yeast extract obtained by the method. In the autolysis process, yeast entogenous enzyme is effectively activated by adjusting a pH value, and conversion rate of products is improved. The yeast extract produced by the method has obviously improved contents of protein and amino-acid nitrogen.